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Testing Oleic‐SDS Mixture in the Absence/Presence Na 2 SO 4 as a Phosphate Depressant
Author(s) -
ElMidany Ayman A.,
Arafat Yasir,
AlFariss Tariq F.
Publication year - 2015
Publication title -
journal of surfactants and detergents
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.349
H-Index - 48
eISSN - 1558-9293
pISSN - 1097-3958
DOI - 10.1007/s11743-014-1623-0
Subject(s) - chemistry , oleic acid , sulfate , sodium sulfate , sodium , sodium dodecyl sulfate , phosphate , depressant , nuclear chemistry , chromatography , inorganic chemistry , organic chemistry , biochemistry , pharmacology , medicine
The reverse flotation of calcareous phosphate ores, at acidic pH, usually uses anionic collectors such as oleic acid (Ol) and sodium dodecyl sulfate (SDS). However, using a mixture of two anionic collectors is very rare. In the present paper, a mixture of oleic acid and sodium dodecyl sulfate, with a ratio 1:1, was prepared. Different dosages of Ol–SDS mixture was studied in absence or presence of sodium sulfate as a phosphate depressant at different pH values. The results showed that sodium sulfate works better at highly acidic pH where 30.7 % P 2 O 5 was achieved in presence of sodium sulfate in comparison to 29 % P 2 O 5 at pH 4 and 0.5 kg/t collector dosage. However, by increasing the pH, the sodium sulfate negatively affects the concentrate grade. Moreover, the sodium sulfate maintains the grade and recovery almost unchanged within the studied pH range. Although a concentrate grade exceeds 30 % P 2 O 5 could be achieved with or without addition of sodium sulfate, the highest concentrate grade of 33 % P 2 O 5 was obtained with 85 % recovery at 3.5 kg/t collector dosage and pH 6 with no sodium sulfate additions.